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A low temperature stop valve, Unlike Example 1, Comprises a valve body 1 and a valve cover 2, A valve stem 3 is arrange in that valve body 1, One end of the valve stem 3 is provided with a valve disc 4, The other end of the valve stem 3 is provided with an adjusting handwheel 5, A low portion of that disc 4 is provided with a guide sleeve 6, The guide sleeve 6 is fixed by means of a connecting piece and a spring pad 8, Between that disc 4 and the guide sleeve 6 is provide a valve seat 7, A packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, the O-ring 10 is further arranged at the upper part of the packing assembly 9, the upper part of the O-ring 10 is provided with a packing gland 11, the valve body 1 is provided with an arc-shaped end face 12 which forms a line seal between the valve body 1 and the valve seat 7, and the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41, the packing assembly 9 comprises a flexible graphite packing layer.刘邦不置可否地笑了笑，说道：这小子太精，结盟归结盟，以后还是得防着他点。与此同时，他也在等待冒顿单于的主力支援和命令下达。一说起此事，萧何便带着笑容，很是开心道：我们的粮仓管理一直比较混乱，加之巴蜀气候潮湿，很多都受潮发霉了。What does this survey show-different life plans have distanced everyone.以朝鲜光海君为了逃避被毒杀的危机，便由与其相貌酷似的平民代替了王的身份为主题，讲述光海君在朝鲜历史上消失的那15天里所未人知的故事。Zhao Yuan, founder of Yixiu Mathematical Thinking: "Thinking ability products are not as direct and obvious as programming can make some programs, or as direct and obvious as mathematics can calculate a problem. Therefore, how to formulate an evaluation standard recognized by parents and present the curriculum effect is a big challenge that the industry will face."